CN103038832A

CN103038832A - Shut-off device for a nuclear reactor fluid duct, in particular for a steam generator bottom drain

Info

Publication number: CN103038832A
Application number: CN2011800248302A
Authority: CN
Inventors: 吉尔斯·卡帕拉; 沃尔特-约翰·奇蒂; 简·菲利普·威尔特
Original assignee: Framatome ANP SAS
Current assignee: Areva NP SAS
Priority date: 2010-03-18
Filing date: 2011-03-18
Publication date: 2013-04-10
Anticipated expiration: 2031-03-18
Also published as: WO2011114077A3; FR2957709A1; JP2013522616A; EP2548206A2; KR20130080001A; US20130108002A1; CN103038832B; WO2011114077A2; EP2548206B1; FR2957709B1

Abstract

The shut-offdevice (27) for a nuclear reactor component duct comprises: - a plurality of elastic sealing rings (41), each expandable radially with respect to a common longitudinal axis between a retracted position at a distance from a wall of the duct and an expanded position for leaktight contact with the wall of the duct; - a device designed to selectively move the sealing rings (41) between their retracted positions and their expanded positions; - at least one member (43) for locking in position the shut-off device (27) in the duct to be shut off, which member is separate from the sealing rings (41) and is expandable radially with respect to the central axis between a retracted position in which the locking member (43) is moved away from the wall of the duct and a locking position in which the locking member bears against the wall of the duct; ; - a device designed to selectively move the locking member (43) between its retracted position and its locking position.

Description

Be used for the nuclear reactor fluid conduit systems, in particular for the stopping device of steam generator bottom drainage tube

Technical field

The application relates generally to the stopping device for the nuclear reactor fluid conduit systems, and relates more specifically to the stopping device for steam generator water tank drainage tube.

Background technology

As shown in Figure 1, steam generator 1 has the space that is called " water tank " 3 in the bottom.Water tank 3 is delimited by the lower bottom part 7 of the steam generator of the pipe dish 5 of top and below.Water tank 3 is divided into two spaces by inner partition wall 9: entrance space 11 and outlet space 13.The water of the storage tank that comes autothermal reactor of the first circuit in being made in lower bottom part 7 entrance 15 and penetrate into entrance space 11.The water of the first circuit circulation in the set of the pipe of steam generator and with its thermal release to second fluid after, penetrate outlet space 13 and flow out outlet space 13 through unshowned outlet.The pipe set is not shown in Figure 1.Each pipe of pipe set has the end, upstream of opening by 5 engagements of pipe dish and in the entrance space 11, and the downstream end of opening by 5 engagements of pipe dish and in the outlet space 13.

In addition, in order to allow the maintenance work in the water tank 3, be shaped with manhole 17 in the bottom 7 of steam generator.By manhole, can enter entrance space 11, and can enter outlet space 13 by another manhole.Partition wall 9 is separated entrance space 11 and outlet space 13 fully.

During the steam generator normal running, manhole 17 is closed, and the continuously circulation of the outlet tubing (not shown) to the first circuit from entrance tubing 15 of the water of the first circuit.

Must periodically in water tank, maintain operation.These operational example are such as the integrity of the pipe of the pipe set that is intended to check steam generator, perhaps are intended to close to have unusual pipe.

In order to carry out such maintenance operation, at first make reactor stop.The lid of storage tank is removed, so that the first circuit is communicated with stillpot.

Then steam generator is emptied.Make the surface level in the pond of reactor drop to the surface level of the lower bottom part 7 that is lower than steam generator for this reason.

As shown in Figure 1, the lower point 19 of the bottom of steam generator is positioned at the surface level place at the edge that is lower than entrance 15.For outlet, situation is the same.

For being close to the bottom 7 that fully empties steam generator, 7 are shaped with drainage tube 21 in the bottom.Drainage tube 21 shown in Fig. 1 and Fig. 2 is conduits of minor diameter, with near the entrance 23 of lower point 19, opening in water tank inside, and the outlet 25 of opening in the entrance tubing 15 of the first circuit.Drainage tube 21 is low dip slightly, is circulated to farthest the first liquid entrance 15 from lower point 19 so that can utilize the gravity of first liquid.

When the surface level of stillpot is lowered so that during Clean water tank empty 3, drainage tube 21 can be emitted water tank with being close to whole first liquids, and the first liquid of quite few remaining amount is only arranged at the surface level place of the entrance that is lower than drainage tube 21.

Near outlet tubing, be shaped with similar drainage tube.

Then stopper 16 is placed on entrance 15 and the outlet (not shown) through manhole by specific machinery.When the water level in the stillpot raises, do not penetrate water tank 3 in order to make first liquid, operating period stopping device 27 is positioned at drainage tube 21 inside in maintenance.

By the operator this stopping device 27 is put into drainage tube 21 from water tank 3.Then the water level of stillpot just can raise.

The operation that is used for placing stopping device 27 at drainage tube 21 is meticulous, and described stopping device must be very reliable, and its reason has several.

Must in drainage tube 21, stopping device 27 shutoff be put in place in reliable especially mode.In fact, after the water level in the stillpot was raise, stopping device 21 was subject to the pressure of first liquid.If stopping device 21 is discharged from, then described first liquid can flow through drainage tube 21 and arrives farthest in the water tank 3, and enters reactor building of nuclear by passing manhole 17 in the water tank 3.Such leakage can cause the delay of sizable maintenance operation and can postpone restarting of nuclear reactor.

The placement of stopping device should be tried one's best rapidly, so that restriction is to getting involved the radiation of the operator in the water tank.

In case after in place in drainage tube, stopping device should be able to be removed easily and can not be blocked.

Therefore, there are the needs to such device, can close and seal drainage tube be used to the bottom of the water tank that empties steam generator in fully reliable mode with described device, in order to support the overvoltage that causes because of the rising of the water level in the stillpot.

Summary of the invention

For this reason, the application relates to a kind of stopping device of the conduit for nuclear reactor component, and described stopping device comprises:

A plurality of elastic seal rings, each elastic seal ring can seal between the expanded position that contacts at the retracted position of a certain distance of wall of the described conduit of distance with the described wall of described conduit with respect to common axis and make radial dilatation;

Be provided for the device that described O-ring seal optionally is subjected to displacement between the expanded position of the retracted position of described O-ring seal and described O-ring seal;

At least one is used at the element of wanting pent described conduit that described stopping device locking is put in place, and described locking member separates with described O-ring seal, can make radial dilatation between the expanded position on the described wall that described locking member bears against described conduit away from retracted position and the described locking member of the described wall of described conduit with respect to described axis;

Be provided for the device that described locking member optionally is subjected to displacement between the expanded position of the retracted position of described locking member and described locking member,

Its characteristic is, described stopping device comprises main body and can make with respect to described main body the control lever of axial displacement, described control lever is arranged to by being used for making described device that described O-ring seal is subjected to displacement between the expanded position of the retracted position of described O-ring seal and described O-ring seal and drives described O-ring seal, and drives described locking member by being used for making described device that described locking member is subjected to displacement between the expanded position of the retracted position of described locking member and described locking member; Described control lever can be subjected to displacement by sliding to anterior locations with respect to described main body, so that described O-ring seal is in retracted position, and described locking position element is contracted; Described stopping device comprises that at least one returns elastically element, the described element that returns elastically advances described O-ring seal and advances described locking member towards the latched position of described locking member towards the expanded position of described O-ring seal, so that be enough to discharge described control lever, thereby described stopping device is clamped in described catheter interior, and described O-ring seal produce sealing between described stopping device and described conduit.

Following one or more features that described stopping device also can have separately or take in according to all technical possible combinations:

The described device that is used for described O-ring seal is subjected to displacement comprises the first extruded member and the second extruded member of vertically separating and be positioned each other described O-ring seal either side, described the first extruded member is attached on the described control lever, and can be subjected to displacement towards described the second extruded member by described control lever;

Described the first extruded member is attached on the described control lever by removable connecting piece;

Described locking member is cylindrical fixture, and described cylindrical fixture comprises a plurality of blades that circumferentially distribute around described axis at the first end place, and each blade has columniform outside surface and Frusto-conical inside surface at place, an end;

Described stopping device will be placed in the conduit, this conduit bear with will be sealed in described conduit in the relevant pressure field of fluid, described stopping device comprise along described control lever location with lower member:

Head, described head form the described end that is attached to described control lever and will be towards described first extruded member of described pressure field orientation,

Between described the first extruded member and described the second extruded member, can be installed to slidably the described O-ring seal on the described control lever,

Can be installed to slidably described the second extruded member on the described control lever, be formed for described device that described locking member optionally is subjected to displacement, and comprise spherical surface, described spherical surface is provided on each fi-ustoconical surface of the described end that is engaged to described blade under the impact of described control lever with respect to the displacement of described main body, the described end of described blade forms the described first end of described cylindrical fixture

The frusto-conical shape of the described inside surface of the described first end of described cylindrical fixture for dispersing towards described pressure field, so that when described stopping device bears described pressure field, the described first end of described anchor clamps is opened, in order to clamp described stopping device in described catheter interior;

Described stopping device comprises at an axial end portion place and is provided for the circle of displacing moisture or material deposit from the described wall of described conduit;

Described stopping device comprises a plurality of anti-circle of extruding that is embedded between the described O-ring seal, and the described anti-circle of extruding is provided for the axle pressure of disperseing in the described O-ring seal.

According to second aspect, the application relates to a kind of closing assembly, comprise stopping device with above-mentioned feature and the instrument that is used for firmly grasping described stopping device, described promptly instrument comprises be used to the head of firmly grasping described stopping device and is used for making described control lever to be displaced to farthest described O-ring seal and is in the mechanism that retracted position and described locking member are in the position of retracted position.

Described assembly also can comprise following one or more feature:

Described promptly instrument can adopt primary importance and the second place, in described primary importance, described promptly head is attached on the described stopping device rigidly, in the described second place, described promptly head can separate with described stopping device, described promptly head locks onto described primary importance with the described control lever of the described stopping device on the anterior locations, described promptly instrument further comprises returning element and being used for locking the described promptly removable element of instrument towards the described promptly instrument of described second place propelling, described removable element can lock onto described primary importance with described promptly instrument, and described promptly instrument solution can be locked into the described second place;

Described promptly instrument has elongated shape along main direction, and can adopt primary importance, in described primary importance, described promptly head is attached on the described stopping device rigidly, in the described promptly described primary importance of instrument, described main direction is basically perpendicular to the axis of described stopping device.

Description of drawings

By below with reference to accompanying drawing as signal and the unrestricted detailed explanation that provides, will understand the application's further feature and beneficial effect, wherein

Fig. 1 is the axial cut-open view of the bottom of steam generator;

Fig. 2 is the cut-open view of amplification of the details of Fig. 1, shows the drainage tube of the bottom of the water tank that can be used for emptying steam generator, and is engaged in the inside of described drainage tube according to the application's stopping device;

Fig. 3 is the longitudinal sectional view of the stopping device of Fig. 2;

Fig. 4 is the outer side view of the stopping device of Fig. 3;

Fig. 5 is the view of similar Fig. 3, thus further show for described stopping device is promptly put in place so that O-ring seal at retracted position and the locking member instrument at retracted position; And

Fig. 6 is the cut-open view for the instrument of firmly grasping described stopping device.

Embodiment

Stopping device shown in Fig. 3 more specifically is used for the bottom drainage tube of steam off generator, for example above-mentioned drainage tube 21 shown in Figure 1.

Stopping device 27 comprises:

Tubular body 29 with axis X;

The control lever 31 that extends along axis X in main body 29 inside;

The head 33 of the front axle that is attached to control lever 31 by the pin 37 that can not lose on the end 35;

Expander core 39 has the general tube shape shape of spherical span (spherical span), slides at this control lever 31 around control lever 31;

A plurality of flexible O-ring seals 41 are embedded with also as anti-the extruding of the function of flexible, as to have dispersions (distribute) O-ring seal 41 compressing load and enclose 42.Elastic ring 41 and 42 slides at this control lever 31 around control lever 31, and axially upper between head 33 and expander core 39;

Cylindrical fixture has radial dilatation section 43, and this radial dilatation section 43 is formed for described stopping device is locked in element in the described drainage tube, slide at this control lever 31 around control lever 31, and the front axle that is fastened to tubular body 29 is on end 45;

Boots section 47, (by being spirally connected or welding) is fastened on the rear axial end 49 of main body 29;

A plurality of (dish formula (Bellevilletype)) elastomeric pad 51 is positioned at main body 29 inside, and slides at this control lever 31 around control lever 31.Two elastomeric pads 51 that are positioned at leading section and rearward end place in described a plurality of pad only are shown among Fig. 3.

In the present note, term " front " and " afterwards " are for the head 33 that refers to axially to turn to the head 33 of described stopping device or axially leave described stopping device respectively.

Head 33 has to the forefoot area of round tip 52 convergences.Head 33 has female (tapped) blind hole 53 of opening backward in inside.The leading section 35 of described control lever is engaged in the blind hole 53.The front end 35 of described control lever possesses the external thread with the female threaded engagement of blind hole 53.

In addition, head 22 is included on its whole diameter across head 33 and across several radially holes 55 (Fig. 4) of blind hole 53.The leading section 35 of described control lever comprises the groove 57 of axial orientation.Pin 37 is engaged in one of hole 55, and passes groove 57.The pin 37 that can not lose centers on axle X rotatably fastening control lever 31 and head 33.

Expander core 39 has passage 59 in inside, passage 59 has the inside diameter corresponding to the outer dia of control lever 31.Core 39 has super thick 61 at its leading section.Delimited by spherical surface 63 backwards for super thick 61, spherical surface 63 is for the expansion of the locking lobe that causes (as described below) cylindrical fixture 43.

Super thick (overthickness) 61 delimited by annular support surface 65 forward, and annular support surface 65 is basically perpendicular to axle X.

Head 33 is delimited by the second annular support surface 67 backwards, and the second annular support surface 67 is also perpendicular to the X-axis line.Elastic ring 41 and 42 axially is embedded between the first and second annular support surface 65 and 67.

Locking member 43 has the shape of cylindrical fixture, and described cylindrical fixture comprises guide bearing 69, and a plurality of flexible blades 71 that extend forward from bearing 69.Preferred blade 71 and bearing 69 are made single part.Alternatively, the blade of described cylindrical fixture (blade) 71 separates with bearing 69, and for example is spirally connected or welds by any suitable measure and be attached on the bearing 69.Guide bearing 69 possesses external thread 73.Guide bearing 69 is engaged in the leading section 45 of main body 29.This leading section comprises suitable female screw thread 75 in inside, so that the screw thread 73 of fitted bearing 69.Locking member 43 is attached on the main body 29 thus.In addition, screw thread 73 and female screw thread 75 also have the prestressed function (as seen following) of adjustable elastic pad 51.

Blade 71 is all identical, and circumferentially distributes regularly around axle X.For example, described cylindrical fixture comprises six blades 71.These blades 71 are separated from each other by the slit 77 of outwards opening forward, and (namely in described cylindrical part side) closure backwards.

Blade 71 has been delimited together to have and substantially has been the inner space 79 (Fig. 5) of cylinder form.Control lever 31 is axially across inner space 79.Expander core 39 is engaged in the inner space 79, radially between control lever 31 and blade 71.The slightly larger in diameter of inner space 79 is in the outer dia at the rear portion of core 39.

The front free end 81 (Fig. 5) of blade 71 comprises super thick 83, and the outer surface of front free end 81 is cylindrical, so as in described latched position near the inside surface of described drainage tube and breasting on it.In addition, front free end 81 has inner radial surface 85 (Fig. 5), and inner radial surface 85 defines basic frusto-conical shape for dispersing before backward together.Surface 85 be used for to cooperate the spherical surfaces 63 of core 39, so that expanding blade 71 radially, in order in described drainage tube, clamp described stopping device.

The guide bearing 69 of described locking member has been delimited columniform passage 87 in inside, columniform passage 87 has the inside diameter corresponding to the outer dia of control lever 31.Described control lever is engaged in the passage 87, and across described passage.Between the passage 87 of small diameter and larger-diameter inner space 79, be formed with shoulder 89 (Fig. 5).

Control lever 31 is columniform bar.It comprises the major part 90 with given diameter, and the rearward end 91 with diameter of increase.Shoulder 92 separates part 90 and part 91.

Flexible pad 51 is dish formula or what is called (SUPRATEC registered trademark) formula.Its major part 90 around described control lever is slided at this control lever 31.Pad 51 is close to each other stacking to shoulder 92 from the rearward end 95 of bearing 69.Described flexible pad occupies the rearward end 95 of bearing 69 and the whole space between the shoulder 92.Described pad both had been bearing on the rearward end 95, also was bearing on the shoulder 92.Described pad advances control lever 31 backward.Described pad is calibrated in order to apply propelling power with predetermined power on bar 31 together.Can be by change around the number of described bar at the pad 51 of these control lever 31 slips, or the setting by changing described pad (relative, parallel, two parallel pads continue with the pad of two relative directions etc.), regulate by pad 51 and be applied to prestress on the bar 31.Screw rod by being formed by guide bearing 69-nut system realizes the final adjusting to the power that is applied by described pad, and guide bearing 69 is provided with external thread 73, and external thread 73 is screwed in the female screw thread 75 of inside of tubular body 29.

Control lever 31 extends along axis X.It is fully across main body 29, locking member 43, expander core 39 and elastic ring 41,42.It is fastened on the head 33, and it is free to slide with respect to circle 41 and 42, core 39, locking member 43 and main body 29.

Boots section (shoe) 47 is attached on the rearward end 49 of main body 29.For this reason, boots section 47 comprises front cylindrical part 97 (Fig. 5), and part 97 possesses external thread, the female threaded engagement of the inside of the rearward end of this external thread and main body 29.This boots section 47 extends axially main body 29 backward.Boots section 47 comprises the tube chamber 99 be used to the square circle of firmly grasping described stopping device, and columniform hole 101, and hole 101 is used for allowing described control lever pass, and makes the inside of tube chamber 99 and the internal communication of main body 29.The front cylindrical part 97 of described boots section comprises groove 94, and pin 93 can be free to slide in groove 94, and pin 93 is attached on the bar 31, is used for that boots section 27 and bar 31 can be turned ground fastening.Tube chamber 99 is along being basically perpendicular to the direction of X-axis line fully across boots section 47.It is elongated shape along the X-axis line.Cylindrical cavity 101 axially extends forward from tube chamber 99.Cylindrical cavity 101 is across the threaded part 97 of described boots section, and opens to the inside of main body 29.Control lever 31 and its rear portion 91 engagements, rear portion 91 is free to slide in hole 101.The inside diameter of hole 101 is substantially corresponding to the outer dia of part 91.The rearward end of part 91 in tube chamber 99 inside to hole 101 outer protrusions.

In addition, boots section 47 possesses the radially ear 104 of radially protruding with respect to main body 29.

Stopping device 27 typically comprises two kinds of dissimilar elastic rings 41 and 42 of being made by the elastic body of different hardness and diameter.The circle 41 of the first type is elastomer sealing ring.The flexible circle 42 of the second type is the anti-circle of extruding, and the anti-function of extruding circle is when pressure is applied on the head 33 of described stopping device, will oppress load and list to enclosing.Compare with the anti-elastic body of extruding circle 42, O-ring seal 41 is made with the elastic body of soft, different materials more, and the slightly larger in diameter of O-ring seal 41 is in the anti-diameter of extruding circle 42.The circle of the first and the second type axially replaces along described control lever.Preferably see the anti-circle 42 of extruding in the front of the rearward end of the stacking of elastic ring.

In addition, described stopping device can comprise the sept 103 that is equipped with cylindrical brush, is used for driving off moisture and material deposit from the wall of the drainage tube that will embed described stopping device.Sept 103 is installed in elastic ring 41,42 front, and for example between elastic ring 41,42 and the pressure surface 67 of head 33 between.Sept 103 also can be replaced by scraping blade.

As shown in Figure 3, described stopping device is in closed condition (described circle expansion) usually.Under this state, control lever 31 is advanced backward by elastomeric pad 51, to back location.When described stopping device is not subject to load when (namely not embedding in the drainage tube 21), this back location is limited by the rear axial end of core 39, can axially the recline shoulder 89 of described locking member of the rear axial end of core 39.When described stopping device is embedded in the drainage tube 21, leave remaining play between the axial rearward end section of core 39 and shoulder 89, the locking in the described drainage tube is realized on super thick 83 cylindrical outer surface of the flexible blade 71 that changes by the inwall at described drainage tube.At this back location place, the little axial length of described control lever in the tube chamber 99 of described boots section protrudes.

Head 33 controlled bars 31 drive, and can oppress elastic ring 41,42.These elastic rings are stuck between two pressure surfaces 65 and 67, and are axially oppressed.Axially compressing causes the radial dilatation of described elastic ring, and to expanded position, on described expanded position, O-ring seal 41 bears against on the inwall of drainage tube 21.

As implied above, control lever 31 is to the short effect of moving backward expander core 39 that also has of axially driving of its back location.Therefore, ball 63 is understood the axially inside surface 85 of breasting blade 71.This axially drives urgees to cause blade 71 radial dilatation to each latched position, and on described each latched position, the outside cylindrical surface of the end 83 of blade 71 can bear against on the inwall of described drainage tube.

It is compressing power on the elastic ring 41,42 that the power that is applied by pad 51 is scattered, and the expansionary force on the blade 71.By acting on many factors, particularly act on the section profile (for example by acting on the angle of described circular cone) on the interior conical surface 85 of the material of the material of elastic ring 41 and 42 and size, blade 71 and size, ball 63 and described blade, calibrate described force distribution.

By elastomeric pad 51 pass to circle 41 and 42 and the deformation energy of blade 71 must the sufficient to guarantee sealing function and described stopping device shutoff put in place, enough gentleness simultaneously is so that blade 71 surface of induced damage resistive drainage tube 21 not.This energy also should be used for promptly instrument by the following stated with the operator is subjected to displacement described O-ring seal and locking member and the power of the maximum that can provide is suitable.

Control lever 31 can (for example by Fig. 5 and instrument 102 shown in Figure 6) axially be subjected to displacement forward to the anterior locations shown in Fig. 5 with respect to main body 29.This instrument will illustrate subsequently.Slide to realize the displacement of control lever 31 by the return force against elastomeric pad 51.Control lever 31 drive head 33 effect forward is to reduce elastic ring 41,42 axial compressing, and reduces to be applied to by ball 63 and axially drive short power on the blade 71.Therefore, elastic ring 41,42 turns back to retracted position, and on described retracted position, the diameter that described circle has separately is less than the diameter on each comfortable expanded position.Blade 71 also flexibly turns back on the retracted position, and on this retracted position, described blade is compared with on its latched position the time, and radially outward the degree of space distribution is lower from the axis of described stopping device.

The instrument that Fig. 6 illustrates and Fig. 5 partly illustrates is intended to for firmly grasping, place and recall Fig. 3 to stopping device shown in Figure 5.

As seen from Figure 6, this instrument 102 is such anchor clamps, and described anchor clamps comprise pivot connecting piece 109 between the first and

second arms

105 and 107, two arms, return elastically element 111 and lock 113.Arm 105,107 includes sleeve 115,117 from the upside of described pivot connecting piece separately, and includes L shaped hook portion 119,121 from the downside of described pivot connecting piece.Hook portion 119,121 free end are substantially directed in opposite directions.These directions are basically perpendicular to the axis separately of sleeve 115 and 117.The rotation axis of pivot connecting piece 109 is basically perpendicular to the plane that hook

portion

119 and 121 is included.

Hook portion

119 and 121 is formed for the promptly head of stopping device 27.

Flexible member 111 is between

sleeve

115 and 117, and propelling sleeve 117 109 rotations along direction disconnected from each other around the pivot connecting piece.Lock 113 for example is attached on the upper end of sleeve 115, and is locked to each other for

sleeve

115 and 117 return forces against flexible member 111 are being pasted.Sleeve 115 further possesses for the hoop 122 that described arm is led.

On the position shown in Fig. 6,

sleeve

115 and 117 moves away from each other by flexible member 111, and

hook portion

119 and 121 is on the position closer proximity to each other.On this position,

hook portion

119 and 121 be directed in the circular tube chamber 99 of square of boots section of described stopping device.Point to this axis orientation along this described stopping device of rightabout end group of two hook portions.Then can make

sleeve

115 and 117 closer proximity to each other by the

direction pivot sleeve

115 and 117 against the return force of flexible member 111.As shown in Figure 5, the end of L shaped hook portion 121 forms shoulder, and described shoulder will be contained under the peripheral edge of tube chamber 99 at the rearward end place of the tube chamber of the square circle of boots section 47.The end of hook portion 119 axially is engaged in the cylindrical cavity 101, and control lever 31 is subjected to displacement to its anterior locations.This effect that has is that elastic ring 41,42 is placed on its retracted position, and blade 71 is placed on its retracted position.

Interface between instrument 102 and the stopping device 27 avoids the accident of these two parts to break away from engagement.This is particularly caused by the bowl-like shape on the surface 125 of the end 91 of hook portion 119,121 geometric configuration and described control lever.This surface 125 is returned to tube chamber 99, and is used for cooperating with hook portion 119.Described instrument locks and rotates in boots section 99 thus and lock and put in place by two hook portions 119,121 opposite two ends at tube chamber 99.This has limited described stopping device significantly in the risk of placing and getting loose during the removal stage.

Lock 113

permission sleeves

115 and 117 are pasting and are keeping each other smooth.

On this latched position of instrument 102, the operator can be subjected to displacement described stopping device 27 by firmly grasping instrument 102.He/her can be particularly be incorporated into described stopping device in the drainage tube 21 in mode very easily, and the head 33 of described stopping device at first penetrates into described drainage tube by the entrance 23 of described drainage tube.When described stopping device is engaged in the drainage tube 21 fully, 104 peripheral edges with the entrance 23 of the described drainage tube of breasting of ear.This prevents that described stopping device from sliding and fall into the entrance 15 of the tubing of main line along described drainage tube.Head 33, main body 29, the elastic ring 41 on the retracted position, 42 and the outer dia of blade 71 on retracted position be slightly less than the inside diameter of drainage tube 21.

As shown in Figure 2, in case in place, the shape of the inside surface of the bottom of boots section 47 applying steam generators.This provides the possibility of the uncontinuity of remarkable reduction geometric configuration, and avoids thus any interference to equipment or damage, or to get involved the injury of the operator in the water tank in maintenance operating period.

In case described stopping device is in place in described drainage tube, the user will lock 113 releases, and allow

sleeve

115 and 117 certainly be moved away from each other under the effect of flexible member 111.Then 102 of instruments are in the unlocked position, and on this unlocked position, the user then can make

hook portion

119 and 121 break away from engagement in tube chamber 99.

Under the impact of the effect of elastomeric pad 51, O-ring seal 41 adopts its expanded position, and namely O-ring seal 41 is in to seal with the wall of described drainage tube and contacts.In addition, blade 71 adopts its locking and flange position, i.e. the wall of the described conduit of blade 71 breastings, and described stopping device locked put in place.

Recalling according to antipodal program of described stopping device realizes.

Above-described stopping device has the multiple beneficial effect.

Since its have separate with described O-ring seal, be used for element that described stopping device is put in place in described conduit locking, thereby guaranteed reliably described stopping device locking is put in place.In fact, these are different elements of guaranteeing two kinds of functions (namely seal with locking and put in place).

O-ring seal 41 and anti-ly extrude circle 42 and described locking member is subjected to displacement by same control lever, the compact design that this has allowed described stopping device is applicable to the conduit of minor diameter.By by the extruded member that is subjected to displacement towards each other through described control lever, described elastic ring is shifted to its expanded position from its retracted position, so also can obtain the simple of described stopping device and compact structure.

The fact that one of described two extruded member (head 33) can be opened allows described elastic ring easily to be replaced when wearing and tearing.

Radially the use of distensible blade allows effectively to clamp described stopping device in described drainage tube.The use of the lip-deep spherical surface of interior conical that is squeezed in described blade that is used for expanding described blade is mechanically simple and compact and without any the possibility of the risk of shutoff to the described stopping device of sening as an envoy to.

Described control lever is movably true by sliding with respect to described main body have been guaranteed applied in the situation of high pressure by the head of first liquid at described stopping device, and the pressure that described locking member is being pasted the inwall flattening of described drainage tube is increased.The pressure of described first liquid is higher, and the clamping force of described stopping device in described drainage tube is larger, and this allows the increase of fixed performance, and described stopping device is discharged from during can avoiding unexpected overvoltage.

Described stopping device comprises towards the expanded position of elastic ring and advances elastic ring 41,42 and advance the fact that returns elastically element (pad 51) of described locking member to guarantee the significantly placement of convenient described stopping device towards the latched position of locking member.In fact, as mentioned above, unclamping described control lever is enough to make described stopping device at the inner flange of described drainage tube, and makes described elastic ring produce sealing between the inwall of described stopping device and described drainage tube.The operator needn't regulate by instrument and tighten up torsional moment.Elastomeric pad 51 is calibrated, so that automatic acquisition is enough to make the recline pressure of inwall of described drainage tube of described elastic ring and described locking member.

Thereby facilitate the placement of described stopping device, so that the operator can be in the water tank internal stops time still less, and make the dosage that is merged by these operators keep minimum.

The risk that described stopping device blocks in described drainage tube inside also is minimized, because as long as promoted in order to the described control lever of the described stopping device of release.In addition, the contacting of " circular cone on the ball " at the blade place of described expander core and described cylindrical fixture prevented that also described cylindrical fixture is trapped on the flange position.

Described boots section possesses prevents that described boots section from penetrating into ear in the described drainage tube fully and having reduced significantly described stopping device is lost in risk in described the first circuit.

In addition, as shown in Figure 1, available space is minimized between the inner partition wall 9 of the entrance 23 of described drainage tube and described water tank.By using the locking member that separates with described O-ring seal, can limit the axial obstruction of described stopping device.In order only to obtain the identical clamping force of described stopping device at described conduit with elastic ring, must use the more elastic ring of big figure, this can significantly increase the axial length of described stopping device.

In addition, promptly instrument 102 has elongated shape in the main direction along sleeve 115, and when promptly instrument 102 was engaged in the boots section 47 of described stopping device, this main direction was basically perpendicular to the axis of stopping device 27.Consider the orientation of drainage tube 21, and between the inner partition wall 9 of the lower bottom part of the hole 23 of described drainage tube and described steam generator available limited space, this facilitates the operator to the processing of stopping device 27.

Described stopping device is adapted to the scrambling that derives from manufacturing tolerance, operation distortion, sediment etc. of the diameter of described drainage tube automatically.Described stopping device can have a plurality of replacement schemes.Be applied to the described O-ring seal of resilience on the described control lever by described elastomeric pad, and drive short described locking member, until the automatic wall of the described drainage tube of breasting of described locking member.Do not require and be useful on the Adjustment operation that configures described stopping device according to the actual diameter of described drainage tube.

Described stopping device can comprise the O-ring seal of any number, and these circles can be any character, and can be comprised of any suitable material.

Can be any suitable type for the device of expanding described O-ring seal.In not preferred alternate embodiment, described circle can be expanded by the inflation measure or by the external cam system.

Described stopping device also can comprise one or more locking members, and these locking members are any suitable type.Described locking member can not comprise radially distensible blade, but for example comprises the radially movable boots of frictional property section.After described blade can point to, and not forward.At this moment, the expansion ball is made in described main body, and described blade is fastened on the described core.

Described locking member and described O-ring seal can be replaced by the mechanism of (for example respectively having special-purpose control lever) completely separate from each other.

In not preferred alternate embodiment, described locking member can be placed on the front of described O-ring seal.

Described flexible member can be not the stacking of dish formula pad, and is the flexible member that is fit to of volute spring or any other type.Described flexible member can not bear against on the rearward end of described locking member, but bears against on the internal rib of described main body.But described flexible member facing backwards bears against on the nut that is spirally connected around described control lever, in order to can regulate the return force of described flexible member.

The tube chamber 99 of the square circle of described boots section can replace with two tube chambers that are separated from each other, as long as each described tube chamber holds one of two hook portions of described promptly instrument.

According to the second aspect that is independent of first aspect, the application can relate to the stopping device for the conduit of nuclear reactor, and described stopping device comprises:

A plurality of elastic seal rings, each elastic seal ring can seal between the expanded position that contacts at the retracted position of a certain distance of wall of the described conduit of distance with the described wall of described conduit with respect to common longitudinal axis and make radial dilatation;

The device that is used for making described O-ring seal optionally to be subjected to displacement between the expanded position of the retracted position of described O-ring seal and described O-ring seal, described device comprises that at least one expanded position towards elastic ring advances the element that returns elastically of described elastic ring.

The explanation of described stopping device is used for the application for the bottom drainage tube of steam generator.Described device can be used for closing nuclear reactor not necessarily in steam generator, and other conduit in any other parts of reactor.These conduits can belong to the first circuit, the second circuit or any other active or inactive circuit.

This conduit can be any diameter.

In any case, above-mentioned stopping device all is particularly useful for such situation, and being placed in the radiation environment of wherein said stopping device realizes.

Claims

1. A closing device for a conduit (21) of a nuclear reactor component, said closing device (27) comprising:

A plurality of elastic sealing rings (41), each elastic sealing ring (41) can be in a retracted position at a certain distance from the wall of the conduit (21) relative to a common central axis and in relation to the conduit (21) radial expansion between expanded locations of said walls in sealing contact;

means provided for selectively displacing said sealing ring (41) between a retracted position of said sealing ring (41) and an expanded position of said sealing ring (41);

at least one element (43) for locking said closing device (27) in place in said conduit (21) to be closed, said locking element (43) being separate from said sealing ring (41 ), capable of In the retracted position of the locking element (43) away from the wall of the conduit (21) with respect to the central axis and the locking element (43) bears against the wall of the conduit (21) Radial expansion between expanded locations on the

means provided for selectively displacing said locking element (43) between a retracted position of said locking element (43) and an expanded position of said locking element (43),

It is characterized in that the closing device comprises a main body (29) and a control rod (31) capable of axially displacing relative to the main body (29), and the control rod (31) is arranged to pass through the said means for displacing the sealing ring (41) to drive said sealing ring (41) between a retracted position of said sealing ring (41) and an expanded position of said sealing ring (41), and by means of said means for displacing said locking element (43) to drive said locking element (43) between a retracted position of said locking element (43) and an expanded position of said locking element (43); said control rod (31) can be displaced by sliding to a front position relative to said main body (29), so that said sealing ring (41) is in a retracted position, and said locking element (43) is in a retracted position; Said closing means comprise at least one elastic return element (51) which urges said sealing ring (41) towards the expanded position of said sealing ring (41) and towards said locking element (43) The locked position advances the locking element (43) enough to release the lever (31), so that the closing device is clamped inside the conduit (21) and the sealing ring (41) is in place. A seal is created between said closing device and said conduit (21).

2. Closing device according to claim 1, characterized in that said means for displacing said sealing ring (41) comprise A first pressing member (33) and a second pressing member (39), said first pressing member (33) being coupled to said control rod (31) and capable of being moved through said control rod (31) Displacement takes place towards said second pressing member (39).

3. Closing device according to claim 2, characterized in that said first pressing member (33) is joined to said lever (31 ) by means of a removable link (37).

4. Closing device according to claim 2 or 3, characterized in that the locking element (43) is a cylindrical clamp comprising at a first end a plurality of distributed blades (71), each having a cylindrical outer surface and a frustoconical inner surface (85) at one end (81).

5. Closing device according to claim 4, characterized in that said closing device is to be placed in a conduit (21) which is subjected to the pressure associated with the fluid to be sealed in said conduit field, said closing device comprises the following components positioned along said lever (31):

a head (33) forming said first extrusion member attached to said end of said control rod and to be oriented towards said pressure field;

said sealing ring (41) slidably mounted to said control rod (31) between said first extruding member (33) and said second extruding member (39);

Said second extrusion member, slidably mounted to said lever, forms said means for selectively displacing said locking element (43) and comprises a spherical surface (63), said Spherical surfaces (63) are provided for engaging to respective frustoconical surfaces of said ends of said vanes (71) under the influence of displacement of said control rod (31) relative to said body (29) (85), said end of said blade (71) forming said first end of said cylindrical clamp; and

Said inner surface (85) of said first end of said cylindrical clamp is of frusto-conical shape diverging towards said pressure field such that when said closing device is subjected to said pressure field, said clamp Said first end of said conduit (21) is open to clamp said closure means inside said conduit (21).

6. Closing device according to any one of the preceding claims, characterized in that said closing device comprises at an axial end a device provided for driving moisture or material from said wall of said conduit. Circles of sediment (103).

7. The closing device according to any one of claims 1 to 6, characterized in that the closing device comprises a plurality of anti-extrusion rings (42) embedded between the sealing rings (41), the The anti-extrusion ring (42) is provided for distributing the axial pressure in the sealing ring (41).

8. A closure assembly comprising a closure (27) according to any one of the preceding claims and a means (102) for grasping said closure (27), said grasping means (102) comprising Heads (119, 121) for gripping the closing device (27) and for displacing the lever (31) furthest until the sealing ring (41) is in the retracted position and the locking element (43) Mechanism in position in retracted position.

9. Assembly according to claim 8, characterized in that said gripping tool (102) can adopt a first position and a second position, in said first position said gripping head (119, 121 ) is rigid attached to the closing device (27), in the second position, the gripping head can be separated from the closing device (27), the gripping head (119, 121) will be on the front position said lever (31) of said closing device (27) is locked to said first position, said grasping tool (102) further comprising:

advancing the return element (111) of said grasping tool (102) towards said second position; and

A removable element (113) for locking said grasping tool (102), said removable element (113) capable of locking said grasping tool in said first position and of said grasping tool The tool is unlocked to said second position.

10. Assembly according to claim 8 or 9, characterized in that said gripping means (102) has an elongated shape in a main direction and can adopt a first position in which said gripping means (102) head (119, 121) is rigidly attached to said closing device (27), said primary direction being substantially perpendicular to said closing device (27) in said first position of said grasping tool (102) of the central axis.